{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical", "Disease"], "input": "Peripheral venous blood samples were withdrawn from the femoral vein four times ( once every 5 min ) before ischemia ( 0 time ) and 5 , 15 , and 30 min after ischemia ."}
{"Chemical": [], "Disease": ["ischemia"]}